A-LevelChemistryHalogen derivatives9701/12 · Oct/Nov 2016 · Q221 Mark

The reaction CH₃CH₂CH₂CH₂Br + OH⁻ → CH₃CH₂CH₂CH₂OH + Br⁻ proceeds via an SN2 mechanism. The reaction (CH₃)₃CBr + OH⁻ → (CH₃)₃COH + Br⁻ proceeds via an SN1 mechanism. Which statement about these two reactions is correct?

ABoth reactions involve homolytic bond fission.

BBoth reactions involve hydroxide ions acting as electron pair donors.

CBoth reactions involve the formation of a positively-charged intermediate.

DBoth reactions occur in a single step.

✓ Correct answer

B: Both reactions involve hydroxide ions acting as electron pair donors.

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 2, question 22.

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